Catharina is said to have been age 89 at death, but I suspect her age was inflated because that would have made her a decade younger than her husband.

1.  Marriage Record:

2.  German Births and Baptisms, 1558-1898 (online at familysearch.org):

Name	Sex	Birthdate	Birthplace	Baptism Date	Baptism Location	Death Date	Father's Name	Mother's Name	Source Film
Daniel Straub	M	01 Jul 1815	Staigmuehle	02 Jul 1815	Geislingen (OA. Geislingen), Württemberg, Germany		Caspar Straub	Margaretha Honold	1659299
Catharina Oechsslen	F	18 May 1816		19 May 1816	Geislingen (OA. Geislingen), Württemberg, Germany		Kaspar Oechsslen	Catharina Ulmer	1659399
Christiane Margaretha Mathilde Straub		16 Sep 1837		19 Sep 1837	Geislingen (OA. Geislingen), Württemberg, Germany	01 Dec 1837	Daniel Straub	Anna Catharina Oechsle	1659299
Kaspar/Caspar Heinrich Straub	M	18 Nov 1839		24 Nov 1839	Geislingen (OA. Geislingen), Württemberg, Germany		Daniel Straub	Anna Katharina/Catharina Oechsle/Oechslen	1659299
Christiane Margarethe Mathilde Straub	F	07 Apr 1841		18 Apr 1841	Geislingen (OA. Geislingen), Württemberg, Germany	25 Aug 1841	Daniel Straub	Anna Catharina Oechsle	1659299
Margarethe Mathilde Straub	F	22 Jul 1844		04 Aug 1844	Geislingen (OA. Geislingen), Württemberg, Germany	02 Sep 1844	Daniel Straub	Anna Catharina Oechsle	1659299

•  "Staigmuehle" appears to be a mis-transcription of "Steigemühle."  "Steige" is German for "climb," which refers to the steeply inclining road and railway in the area, while "mühle" is German for "mill."
•  Oechsle and Oechsslen appear to be interchangeable in these records, so this Catharina may be Daniel's wife.  Kaspar OECHSSLEN appears in other records as Caspar ÖCHSLE.

3.  Daniel Straub (online at de.wikipedia.org).

4.  WFM:  Daniel Straub.  Geschichtsbüro Reder, Roeseling & Prüfer, Cologne, Germany (online at www.geschichtsbuero.de), excerpts, with Google translations on the right.

From what I can gather based on a Google translation, this article is about the chapel/mausoleum erected by our subjects in honor of their only son, Heinrich STRAUB, who died in Kairo (Cairo, Egypt?) at the age of 37.

Kapital 1 p. 6	Am 26. Juli 1836 heiratete Daniel Straub Catharina Oechsle, die Tochter des Geislinger Kapellmüllers. Die Verbindung dieser beiden Müllerfamilien war vor allem wirtschaftlich zweckmäßig, denn damit kamen die beiden örtlichen Getreidemühlen zusammen. Der Kapellmüller Oechsle hatte zwei Töchter und suchte einen geeigneten Nachfolger für seinen Betrieb.	On 26 July 1836 married Daniel Straub Catharina Oechsle, the daughter of Geislinger Kapellmüllers.  Linking the two Mueller family was especially economically useful, because then came the two local mills together.  The Kapellmüller Oechsle had two daughters and looked for a suitable successor to his Operation.
	Zuerst galt die Erkundung der Straub’schen Grabkapelle auf dem Geislinger Friedhof. Peter Lecjaks erwähnte u. a., dass der Bauherr dieser Grabkapelle, Daniel Straub am 1. Juli 1845 als erster Sohn des Schimmelmüllers Kaspar Straub zur Welt kam und schon mit 21 Jahren Anna Katharina Öchsle heiratete, die einzige Tochter des Geislinger Kapell- müllers Lukas Öchsle. An ihn erinnert noch heute im umgebauten MAG-Areal der Kapell- mühlsaal...	First was to explore the Straub'schen grave chapel on the cemetery Geislinger.  Peter Lecjaks mentioned among other things that the owner of this grave chapel, Daniel Straub on First July 1845, the first son of the mold Kaspar Müller Straub was born and already with 21 years Anna Katharina Oechsle, married the only daughter of Geislinger Kapell-miller Luke Oechsle. To remind him today in the renovated premises of Kapell-MAG mühlsaal.

5.  Public Member Trees (online at Ancestry.com):  not found (as of 19 Aug 2012).

6.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com):  Daniel not found (as of 19 Aug 2012), but we do find an unmarried Catharina ÖCHSLE (the one born 18 May 1816).

7.  In the trivia department...

In 1963, when I "left the nest" and set up housekeeping for the first time, I bought a set of "high end" German stainless flatware manufactured by WMF, totally unaware at the time that the company had been founded by a STRAUB.  I use the set (with pride) to this day as my only set of flatware.  The pieces hardly look a day older than when I bought them, and I continue to add pieces to the set — deeply regreting I didn't buy 12 place settings, instead of just 8, and that I didn't buy all the serving pieces available at the time (e.g., a single teaspoon, today, will set you back $80 at Replacements Ltd.!).  See this page for some discussion about this stainless.

WMF stainless is actively bought and sold at eBay, but note that some people mistakenly think WMF stands for "William Fraser."  As you can see above, WMF stands for Württembergische Metallwarenfabrik.  Fraser's Ltd. (now defunct, but formerly in New York) was at one time the U.S. importer / distributor of WMF stainless sold as "Fraser's WMF," hence the mistaken interpretation.  WMF is now distributed in the U.S. by WMF Americas in North Carolina.