The general term is Dating. In Archaeology and geology, the process of determining the approximate numerical age of something is called Absolute Dating. The process of determining the age of something relative to another thing (if it's older or younger) is called Relative Dating.
facebook or carbon dating =]
On his/her birthday, figuring in 20 leap years, they are 29220 days old.
In the business world, the term costing describes the process of figuring out how much something is going to cost. Materials costing, then, is the process of figuring out how much materials are going to cost. Materials include such things as lumber, gravel, cement, fiberglass insulation, etc.
Planning and organizing could be described as the process of figuring out what you want to do (planning) and how you want to do it (organizing).
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Noone knows for a fact, but it is probably trillions and trillions of years old. Scientists will be figuring that out soon i suspect.
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the is you
By talking to them, figuring out what they like, the kind of things they like. Favorite foods.