I am new to the hobby and new to TER. I am looking for someone who will provide rimming and anal to an older gentleman. Any suggestions?

Go to reviews, then search reviews.

You will see scores of filters.

First set up the city where you live, then select all the other attributes you want including rimming.

Then hit enter and you'll get a list of escorts who meet those criteria.

I would suggest that you get VIP membership so that you can then read the reviews.

Welcome to TER

Actually, without VIP status he can't use the filters either.

You might also want to chat with providers in your local area that attract your attention.  They may not post their additional services but may be interested in your request.