5' at 4 yrs old sounds perfect to me.
Boas continue to grow their whole lives, there's no reason she won't end up over 6' or more as the years go by.
There are no hard and fast 'this length = this age' for boas.
Boas can be power fed and reach 6' super quick but it's not healthy for them. Feeding frequency, size and genetics all play a role in how big a boa is.
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