Does the Y have water aerobic classes in the evening

No, only in the morning.

Please see schedule have only seen senior in am

The times and types of classes does change a bit from one schedule to the next. They are pretty consistent about water exercise classes primarily aimed at seniors and those with a disability. They publish a new schedule about every 3 months. Your best bet is to call or stop by and pick up a current copy of class schedules.

I think just in the morning