Belt problem mabee?

1st tractor is lt1000,used it for years as only transportation around property and to pull trailer with.give me ideas what to look for when i get on floor to check things out.Problem,1st i,m 83,2nd ,when i start off lil tractor jumps to get moving bout makes me swallow false teeth , and if i still had hair ,that would go too.Thing runs fine all other ways,no problems.even if i slowly let out pedel,i,ll come out just a bit and then ya better be holdin on,wife thinks im hot rodden it,scars fire outta me.I just want some ideas cause its a hour deal for me to get on floor,and lunch time before i get up.new belt mabe? I,ve never replaced in in years ive had it.other then that,dont have any complaints,cept im not 38 any more.Paul