Many of the elderly are dying alone and these days not even having funerals because of the virus. The elderly easily understand the pope's solicitation for their well being. Instead of focusing only on the suffering physical and mental loss he emphasized the three gifts only the elderly can give to the younger generation: dreams, memories, and prayers.
In other words, it means 'the wise dreams of the elderly', 'memories from abundant years' and 'the prayers of the elderly with all their heart'. These gifts would become a foundation and a new future for the younger generation, who could easily be shaken or fall into difficulties. The Pope's discourse suggests that the elderly should be companions of young people and preachers of the faith.