The average age at death in 2019 was 43 for men and 39 for women.
Call comes after new figures reveal more than 12,000 children were without a home last Christmas.
The Marie Trust was the only homeless walk-in centre that stayed open in Glasgow during the pandemic.
A total of 2884 homeless households reported at least one person rough-sleeping in the last year.
Edinburgh City Council is encouraging owners to help provide accommodation for homeless people.
A total of 19 organisations have formed a collective and will deliver a plan to the Scottish Government.
Charities and voluntary groups are ramping up efforts to support vulnerable people during the Covid-19 crisis.
The Independent Care Review (ICR) revealed those who grow up in care are 'substantially more likely' to struggle later on in life.
Scotland has the highest rate of homeless deaths in the UK, with nearly four people dying a week.
Charities can apply for grants of up to £100,000 a year from the Scottish Government.