You don't lose anything by trying. Go for a "test drive" and see if you like it. Aikido is a good art to check out and if you plan to keep practicing into your "golden years," then I would suggest you really try it. Besides, there's always something new to learn, and most Aikido folks are willing to help you out. Don't be fooled by what anyone else may say about Aikido not being useful in a self defense situation, it works. The learning curve is different from other MA, but you'll learn basic things like "getting out of the way" or "taking uke's balance" quickly and will find they are useful.
By all means, go for it. I have heard of Gallo Sensei in law enforcement circles and he's highly respected. Don't pass up a golden opportunity.