I can not go on in some lands . What I have to do to be allowed . My account is 3 years sl .

[Andinhoeng]

i can not go on in some lands. what i have to do to be allowed. my acconunt is 3 years sl

[Alwin Alcott]

check if your maturity ratings are set to G-M-A, if not aply those settings in your viewer, search and MP.

It's of course also possible you try to enter group only land, or also possible you'r banned.

And if it's gaming sims... check if you meet the requirements to enter those.

[Nalates Urriah]

Alwin gave a good answer...

There is land in SL that is restricted use.

There are places that only Premium Members can enter.

There is land that reuires you be a member of a specific group and have their tag active..

There is land that requires you be on an owner made white list. 

There is land where the owner requires you to have financial information on file.

There is land where your avatar must be over 30 days old to enter.

There is land that requires you accept an Experience to enter.

Of course there is adult land where you must have your G-M-A settings set to Adult.

There are only a couple of these that you can do anything about. The rest are up to the land owner. If they want to let you in, your good. Otherwise, you are out.