A gigasecond is equivalent to 1,000,000,000 (one billion) seconds, which is about 31.7 years.
Oh, dude, let me grab my calculator real quick... okay, so 80 years times 365 days in a year times 24 hours in a day times 60 minutes in an hour times 60 seconds in a minute... drum roll, please... that's a whopping 2,522,880,000 seconds in 80 years. So yeah, like, a lot of seconds.
16 years = 504,910,816 seconds.
There are 1,452,576,000 seconds in 46 years.
There are 1,358,724,800 seconds in 43 years.
There are 1263141040 seconds in 40 years
10 years = 315,569,260 seconds.
18 years is about 568,036,800 seconds.
1,000,000 years = 31,556,736,000,000 seconds
There is about .000000126755 years in 4 seconds.
9 years is about 284,018,400 seconds.
About 1,009,843,200 seconds in 32 years.