Is it normal to have thinner hair on the nape area?

Yes, nape hair tends to thin out as your go lower towards the neck. Generally thinner hair in this area is only concerning if there is active thinning that is getting worse over time- this can be a sign of alopecia and you should see a dermatologist in this case.

Yes, it's quite normal. However if it becomes more extensive than one once had - other diagnoses need to at least be considered. Androgenetic alopecia, alopecia areata, traction alopecia can also affect nape hair. In men, advancing androgenetic alopecia is by far the most common cause of accelerated thinning of nape hair.

Some people have less neck hair than others. Some lose their neck hair as they get older. It may depend upon your genetics