He can only deduct the eligible amount which is age dependent. 

For 2023, the maximum amount of qualified long-term care premiums includible as medical expenses has increased. Qualified long-term care premiums up to the amounts shown below can be included as medical expenses on Schedule A (Form 1040), Itemized Deductions, or in calculating the self-employed health insurance deduction.

• Age 40 or under: $480
• Age 41 to 50: $890
• Age 51 to 60: $1,790
• Age 61 to 70: $4,770
• Age 71 and over: $5,960