Age determination date based on list of life events and occurred date

Summary:

Hello experts,

We have a requirement to determine a person's age based on the conditions below:
1. If employee has been evaluated and enrolled in any of these life events ' Open', 'New Hire', 'Affiliation' Life event after 1/1/of Calendar year, then the age should be determined at new LE date . 

2. If employee doesn't have any of the life events above in the current calendar year, then age for a new LE should be determined at 1/1/ of calendar year

I need help putting this into a fast formula.

How can I check if a person has had any of the Life events listed above.