No, travel insurance is not. They don't even ask health questions. The cost is based on the cost of your trip, and can be as little as $50-$100 for a decent plan on a $5k trip, and about $500 for a year.
Travel insurance for older people with prior conditions can be expensive. My parents visited the US for a few weeks and their insurance cost something like $800 with a $500 deductible. Wasn't even that good either, with a stack of pages with terms and conditions. Fortunately they didn't have to use it.