No other options? No grandsons that could do it for you? Or a friend's son that has good auto skills, and you could give him a couple c notes, and pay for materials? FCP Euro lists a transmission service kit for your car for <$300.
I guess my thought is that by ignoring it, you are passing it on to someone else, who may find themselves with a tranny that should have been serviced earlier.
I'm nowhere near your age, but as I get older, I often think, if I am fortunate enough to avoid having to ever go to a care center, and assuming I have more than sufficient money to take care of my needs, then why not get what I would like to make me happy. If I don't spend it, my kids will. And, for my kids at least, I know that they would want me to spend whatever I want on myself.
So why not service it. Will it matter to you? Almost absolutely not. Could it matter to someone else? Maybe.