I know you mentioned you don't want a pub, but I very much like the
Celtic Knot in Evanston. It might offer familiar food, at least - and the more traditional you order, the better. The restaurant is a bit separated from the bar - and kids are welcome, so I'd guess seniors are too.
Otherwise, I'd say GNR Winner Myron & Phil's if you are looking for meat. Another option might be
Lutz's, which seems to be very very senior-friendly (think lace-doily senior-friendly, though they're now apparently sporting free WiFi) - I only ate there once, but had fun with the step back in time and liked the food. They offer some vegetarian and fish options. They are only open from 11:00 am to 6:00 pm, though.
Celtic Knot
626 Church
Evanston, IL
(847) 864-1679
Myron & Phils
3900 W Devon Ave
(at Proesel Ave)
Lincolnwood, IL 60712
(847) 677-6663
Lutz Continental Cafe & Pastry Shop
2458 W Montrose Ave
(between Artesian Ave & Campbell Ave)
Chicago, IL 60618
(773) 478-7785