Your home.

We loose our time / life with every passing day.

Our birth happened in past and might have been celebrated by our parents & relatives then.

Time travels ahead, same day , date, time etc never comes back.

Only we started counting again from 1st Jan after 365 days.

In other words , celebrate if you want, but it is not the same day coming back as you assume.

May be people celebrate their 'age' after every 365 / 366 days. ie after 365, 730, ...., 1461, ....., 2922, 3287 and so on days.