Sage Stallone's body 'could have laid undiscovered for up to a week' as reports surface home was 'littered with junk' and he had not spoken to family in days ..

Sylvester Stallone's son, 36, found dead at Los Angeles home Friday

Actor 'devastated and grief-stricken' over sudden loss of  eldest child

Sage played the 66-year-old's onscreen son in Rocky V

Autopsy scheduled to take place in next 48 hours

'Friend' of Sylvester Stallone's son Sage says he showed no signs of depression | CLICK  FOR  MORE..