Local actress Zoe Tay's second son Ashton turned 19 yesterday (Sept 23) and she wrote an emotional social media post with advice for the teenager. Zoe, 58, is married to former Republic of Singapore Air Force (RSAF) pilot Philip Chionh, also 58, and they have two other sons Brayden, 21, and Nathan, who turns 16 next month. "In the blink of an eye, you have grown from that little boy who needs mum to hold your hands to a big boy with his own dreams and direction," said Zoe in her post. She said being 19 is the best age in a person's youth, and she feels "relieved and emotional". "Mum is really proud watching you grow up bit by bit, learning…