Your age has nothing to do with it. And since it was not your primary residence, but a "second" home, you are subject to capital gains on it. The 2 to 5 year exclusion on gains is for a home that was your primary residence.
SALE OF HOUSE
If your gain was more than $250,000 filing Single, or more than $500,000 filing Married Filing Jointly the sale must be reported on your tax return. Whether you re-invested the gain in to another house is irrelevant. If you have a Form 1099-S go to Federal>Wages and Income>Less Common Income>Sale of Home (gain or loss)
If you owned and lived in the home as your primary residence for at least 2 of the last 5 years on the date of the sale, you do not have to report the home sale if the gain is less than $250K filing Single, or less than $500K filing Married Filing Jointly (and you both owned and lived in the home for at least 2 years).
- If you are using online TT, you need Premier or Self-Employed software to report the 1099-S
if this was not the taxpayer's principal residence for 2 out of 5 years before sale, there is no principal home sale exclusion. the sale must be reported on schedule D. if there is a loss it is not deductible.