"For a parent?" Hell, for me!.
Restaurants! Give me 10-20% off and call me "senior", "old", "ancient", "geezer" or anything else...
My wife (of 36 years) and I eat out a lot. Fast food, casual dining and fancy dining. A senior discount can range anywhere from $3 to $25 per meal.
Most of the time, the discount equals the tip. Bring on the senior discounts.