From the beginning to the end of Naruto, it took a total of 7 years. In this short period of time, Naruto went from being the weakest to the strongest in the ninja world, and Sakura became an outstanding medical ninja. Sasuke has changed from a middle school boy to a one-armed hero now, and Kakashi has also changed from a Jonin to the Sixth Generation Hokage. In short, every member of Team 7 has undergone more or less changes.
More than ten years later, they appeared in Boruto. At this time, Naruto already had two children.
Naruto was only 12 years old when he first appeared in the Naruto anime and was only 19 years old when he got married. By Boruto, he was already a 32-year-old middle-aged man. In just 20 years, Naruto has aged a lot. He was a sunny boy before, but now he is a decadent uncle.
From this point of view, when Naruto is 70 years old, he will definitely be like the Sandaime, with gray hair and wrinkles, and become the amiable old man of Konoha Ninja Village.
Sasuke is similar in age to Naruto, and was only about 12 years old when he first appeared. Twenty years later, Sasuke has changed even more than Naruto. Not only has he lost the frivolity and arrogance of his youth, but he has even lost one arm. Coupled with wandering outside all year round, it always gives people a feeling of loneliness and loneliness.
Therefore, Sasuke's 70 years old is not too young, and it is very likely that he will become the second Madara. After all, Madara was also responsible for Uchiha's appearance when he was young, but when he got older, he couldn't bear to look at him. After so many years of exposure, Sasuke would not be worse off than Madara, nor would he be any better than Madara.
Sakura is different, even though she grew up with Naruto and Sasuke. But along the way, she secretly learned the secret of keeping her appearance, and she has been able to keep her appearance unchanged since she was a teenager.
What's more, Tsunade, who taught her the art of beauty, is now 70 years old and still looks as beautiful as a girl. When Sakura reaches 70 years old, she will definitely be like Tsunade, still maintaining the beautiful appearance of 20 or 30 years old, and her beauty is very unreal.
Although Kakashi does not have the Jutsu to protect his body, his appearance has greatly slowed down his aging. In the memory of Naruto fans, Kakashi has looked like this since he joined the ANBU. Later, he went through many things, brought out the seventh team, and became the sixth generation Hokage, but his appearance remained unchanged at all.
So when Kakashi turns 70, he won't be very old. He originally had white hair, and most of his face was covered by a mask. Even if he gets older, we can't tell.