YSK VHS video cassettes degrade over time. Under average conditions, the tapes have a life expectancy of about 30 years. Those tapes laying around from the 90's with precious family memories are already significantly degraded. You should look to digitize all of your families VHS tapes now.
from /r/YouShouldKnow
YSK VHS录像带会随着时间的推移而退化。在平均条件下，磁带的预期寿命约为30年。那些躺在90年代的带有珍贵家庭记忆的磁带已经明显退化了。你应该现在就把你家里所有的VHS磁带数字化。