Doyle Brunson once said, "We don't stop playing poker because we get old, we get old because we stop playing poker." I actually think you may have an advantage over the young bucks in that if you're in a goo enough spot to retire you must have some kind of money management skills. Look up
Bankroll Management and you'll do just fine, even while just starting out because it builds in the ability to lose and still maintain a healthy
bankroll. You go up and down the stakes as you win or lose so you level at your own pace.
I say give it a few weeks to a month just to see if it's enjoyable to you. If it is, then it's definitely worth your it, especially if you've got the time and a little bit of money to invest. Of course, there's also
freerolls if you're not able to deposit. However you go about it, know there will be ups and downs and they can last for stretches at a time. Days or a week or more without a winning session. Just ride it out, study and you'll get there.