Human age =100years Lord Brahma age=317882880000000 years

1 Second
60 Seconds = 1 minite
60 Minutes = 1 Hour
24 Hours = 1 Day
7 Days = 1 Week
30 Days = 1 Month
24 Months = 1 Year
10 Years= 1 Decade
100 Years = Human age

Bharath Purans says:
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Kali Yugam = 432000 years
Dvapara Yugam = 864000 years
Treta Yugam = 1296000 years
Khrutha yugam = 1728000 years
4 yugas = 4320000 years (1 Maha yugam)
72 Maha yugas = 311040000 years (1 Manvantharam)
14 Manvantharas =4354560000 years ( 1 kalpamu)
1 kalpamu = ½ day of Brahma
1 Day of brahma = 8709120000 years
1 Year of brahma = 3178828800000 years
Age of brahma = 317882880000000 years