Misc: who is the oldest female solo singer to top the charts?

Questions

who wrote dionne warwick's 'walk on by' and 'say a little prayer'?

what is a group of geese flying?

on december 1, 1990, workers from france and england met in what structure in the middle of the english channel?

sailors lacking vitamin c would contract which disease?

which song did the easybeats record that everyone sang at the end of a work week?