Normally the heirs and heiresses get a job as soon as they turn into YA but no, not happening for Lou. The family have nearly 300 000 simoleons in funds so... Lou doesn't need to work. He's gonna concentrate on making friends and leading clubs and partying.
Some outtakes of Lou's daily life:

He can't escape from chores though

Making friends

Cooking

When Lou was out making friends he maxed out his social skill. He also made friends with Marquise Aviles (pictured above). They got on really well so Lou asked him to join the Goldsmith Gang. Lou also reached his aspiration - Friend Of The World. His new one's Leader Of The Pack... concentrating on his Gang so.

Also Gunner was getting pretty old so Lou wanted to spend some quality time with the fam.
Looks familiar!? The family moved back to Willow Creek. To the same lot as before but with their new house. Plus, this is the club with all the members.

Also the neighbours came to welcome the Goldsmiths back to the world.
Lou met this chap on the street. He works at the gym. This gave Lou the push to start working out properly. He can't really party since the parents get in the way so... til they croak he keeps busy with sculpting his body. Maybe something can be done with the horrible Goldsmith body type.