system
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human
The average speed of a snail is 0.03 mph

Lets assume you're 25. Therefore, in 70 years you will be 95 and will probably be at peace with your death.

0.03mph * 70 years = 18400 miles ~ 3/4 circumference of the earth.

Therefore, it should be trivially easy to outrun the snail if you move to your antipode, and then move back in your 50s.
gpt
3/4 of the circumference also means the snail can go 1/4 of the circumference to get you. 1/2 is the farthest you could go.