Sylvester Stallone celebrates 75th birthday with ‘wonderful family’ after hitting the gym

Sylvester Stallone rang his 75th birthday on Tuesday surrounded by his loved ones. The Rocky star showed off a personalized cake gifted to him by trainer Gunnar Peterson while documenting the festivities on his Instagram. “I walk into the gym and that’s what awaits me,” he captioned a snapshot of him holding a blue cake …