When people are young, anabolism is vigorous, catabolism is slow, and it is easy to gain muscle.
After the age of 30, anabolism slows down, catabolism accelerates, and muscles will decrease. Lose about half a pound to a pound of muscle every year. This is the law of nature.
However, we can reverse or change this natural state by stimulating the body to release more growth hormone through exercise.
Muscle has a characteristic, that is, overwork and excessive recovery. Through exercise, we can accelerate the anabolism of muscles, and we will gradually become stronger if we exceed the speed of catabolism.
In order to make you understand better, what I said is very popular. This is just the basic principle of muscle growth. If explained in detail, it involves many problems in all aspects.
Let me remind you that muscle and strength training is not exactly what we usually say. It requires very standardized exercise, strict load standards, timely dietary supplements, and good rest and recovery. Otherwise, not only will you not grow muscles, but you will also get hurt.
I suggest you go to the gym for training, which is more secure. You can also get guidance from a coach.
27 years old is not too late. Some people are over forty years old, and they have developed beautiful muscles through scientific training. The main thing is not to be afraid of hardship, but to believe in your own potential.
I wish you an early success!