Cash Gifting Formula

cash gifting formula
What is the formula for getting your age in cash each birthday?

If you get your age in cash each year for your birthday as a gift how can you show this in a formula that I can use in a Javascript program?

Ex. 1 year old you get 1 dollar. 2 years old you get 2 dollars so now you have 3 dollars total next you have 5 dollars, etc.

mulla = (age * (age+1))/2;