Inform me please

What does the Consulate of Colombia say about applying for new visa status while in Colombia?  Ask them in your home country.

If you have guaranteed income from your home country you might look at RENTISTA VISA or PEnsionado Visa.  You have to demonstrate your regular guaranteed income with -for the Rentista, bank statements or statements from a corporation saying you work for them and this is your guaranteed income.

For the Pensioado Visa THERE IS NO AGE barrier and you need show your pension or guaranteed income at a much lower level than the RENTISTA.  Once again check at the Colombian consulate in your home city.
MY BLOG IS AT  POBLADOBOY.blogspot.com

I do not think you can change from Student Visa to a visa leading to residence (you need to be here for five years under a visa for resident status -- (or it could be three years- the info varies!)) without returning to your home country to go to the consulate again.  If you are here on a student visa check at your University for info on this. They'll know.

READERS PLEASE CORRECT ME IF I"M WRONG!  The problem is that the Immigration offices and the consulates are updating their systems and things change.  Please go to the consulate. 

Tourist visas --- I don't know what the status is from your country of citizenship.  With a US or Canadian or EU passport you do not need a tourist visa and you may stay for up to 90 day with unlimited ins and outs.