Since a lot of the comments revolve around AARP/UHC vs. Mutual of Omaha, I'll point out that you can go to senior65.com and get a list of quotes that includes both of those companies (as well as some others like Humana and Aetna). But they don't name AARP/UHC, and instead call it "Unpublished Top Insurance Provider" or "Unpublished Top Insurance Provider - May include gym membership."
You don't have to fill out any information other than date of birth, gender, and zip code. Bless you, senior65.com.
For a female turning 65 in Houston, MoO is more expensive than AARP/UHC:
AARP/UHC without gym benefits $158.44
AARP/UHC with gym benefits $163.15
Mutual of Omaha $170.40
I ran the numbers for Austin, and MoO was cheaper for the female turning 65:
AARP/UHC without gym benefits $140.39
AARP/UHC with gym benefits $150.19
Mutual of Omaha $128.15