I am in my 50's and have a large yard with many trees.  On the downside, the Scotts 20 in. push reel mower mower often gets stuck on tree branches and twigs.  But if I clean up the yard first, it does a wonderful job - and I get good exercise in the process!  I like this mower since it is so lightweight, it is easy to handle.  It is quiet and, although I also bought a grass catcher, I've never needed to use it since the grass is finely cut.  My yard looks great!