No Turbo Tax was right. If you turned 65 on Jan 1 it counts for the previous year. See 2018 Publication 501 the asterisk right under the chart on page 2
https://www.irs.gov/pub/irs-prior/p501--2018.pdf
If you were born before January 2, 1954, you're considered to be 65 or older at the end of 2018. (If your spouse died in 2018, see Death of spouse, later. If you're preparing a return for someone who died in 2018, see Death of taxpayer, late
