I am looking for a formula that will find the break even
age. I have columns as follows:

Age Amount Age Amount
62 100 62 0
63 150 63 0
64 200 64 175
65 250 65 225
66 300 66 290
67 350 67 310
68 400 68 425
69 450 69 575

I would like a formula that will return the age at which
the amounts overlap, or break even (the age at which the
second age/amount set of columns catches up with the first
set.

Thanks