I've had mine in place for about 20 years without any problems to adjacent teeth. About the only problem is in the last year the porcelain veneer is starting to wear off. I'd have it resurfaced, but fully expect to need additional bridge work on the other side in the near future so I'm waiting in hope of getting a two-fer package from the dentist when I need it.
At your age, Dale, I'd say the dental work has a very good chance of outlasting you and you'll be buried with it.
It is all about quality of life and where you choose to spend your money. You'll take your teeth and dental work with you, the money will be left behind and not of any use to you. If you enjoy food, don't want to have toothaches for your remaining years, and want to protect the rest of your body from spreading infection and inflammation, it seems to be a no brainer.
I've had this same debate with my 84 year old mother and she is finally getting her 30 year dentures replaced so she can eat something besides mushy food.
She didn't want to spend the money on herself either because she didn't think she'd live long enough to make it a good investment. I told her I'd be sure and have her dentures removed before she is cremated so they can be donated for someone else to use. In the meantime, I want to be able to fix her favorite foods for her and have her enjoy them again.