My kids are teenagers and quite demonstrative in their affection with me and DH. I came from a very physically demonstrative family and we still give spontaneous hugs and kisses to each other.
My mom is 75 and all of my siblings are in their 50s. We still hug and kiss her all the time.
I think for me it is a necessity to have that physical touch with my family. I have to hug them and be hugged by them. My sons are not embarrassed at all to kiss and hug me in public.
It is not typical here, but I am happy that I can get away with it because we are obviously foreigners.