All babies are different and not all babies may be able to walk at 7 months of age.
But some babies can indeed walk at 7 months of age and sometimes as early as 6 months of age.
Some babies may just start pulling themselves up using things such as a coffee table, couch etc by age 6 or 7 months and then again some babies can walk pretty good at 7 and 8 months of age.
It all depends and it's normal if a baby walks at 7 months and it's also normal if they do not.
Some babies may still need help with walking and holding themselves up at 6 and 7 months of age and it can sometimes take until the baby is 12 to 14 months before they are walking really good on their own.
There's really not set age that a baby will walk but it can surprise some people and parents when the baby begins walking earlier than expected.