My little Rocki (aka Munchkin) is just over 2 years old and still follows me around like a shadow.
If I'm in the basement, he's at the top of the stairs with his tiny face peering down. If I'm on the couch, he's on the floor next to my foot. If I'm sitting on the floor, he's curled himself around my legs. If I'm having a shower, he's patiently waiting outside the door until I come out. If I'm upstairs working, he's at the bottom or the top of the staircase waiting with the patience of a saint.
Bruiser is a bit more independent but still exhibits the same traits. He's always around, but he's a little further back.
Shih-Tzus are loyal - they are always there keeping you in sight. They may not be right next to you, but be assured as you're going about your day, they're in the room or just outside the room watching and waiting for you.