I'm sure you were doing the gentlemanly thing but maybe you could have waited until she got to know you better and then offer to mow her lawn. People are not nice nowadays and someone showing kindness is rare so people think their is a motive behind it.

you tried..better luck next time

You couldn't just offer them a basket of fruit or some other neighborly gift? I agree, the father took it too far, but that does have an innuendo just waiting to be called out.

No guy would ever do anything nice for a girl without sexual, or at least romantic, motivations! Seriously though, it's annoying how many people actually think that. If you're nice to a random girl in public she assumes you're a stalker. Chivalry is dead :(

Since when can't young people mow lawns as well as old people?

It does sound fishy. You did say "mow her grass" vs cut your dad's lawn etc... (And why can't the dad do it himself?) Is "fairly young" the same thing as almost legal? Gotta wait before-- you run through her wicked garden Heard that's the place to find ya.

It looks like you'll just be doing the weed whacking.

Your ass is grass and i'm gonna mow it!

A good neighbor would also offer to snake her drain and polish her knobs ;)

In real time events OP probably said "I will go down to maintain your front yard any day."