As a 58 year old geezer with a bad knee.. I went with the Electra Townie 21.. and we LOVE IT... to the point my wife got off her Trek and we found the ladies Townie to match this year..
they are easy to ride.. very stable... I'm riding it 25-35 miles with out any issues..... NOT a mountain bike.. great bike path, road, park bike... has front suspension so the ride is good, but it's the feet forward design that got me back on a bike again... my very high end road bike has been sitting for 15 years, as my knees just don't like that frame style any longer.... they are pricier.... I picked mine new at REI for $525, but found wife's on craigslist after a few weeks of watching the posts for $225...
Love the Townies.....
Ed