A script that collects and prints info about the age of all ruby gems in your project, see https://dev.to/borama/how-old-are-dependencies-in-your-ruby-project-3jia

ruby_gems_age.rb

#!/bin/env ruby
#
# Collects info about the age of all gems in the project
#
require "json"
require "date"

bundle = `bundle list`

yearly_stats = {}
bundle.split(/\n/).each do |line|
  next unless line =~ /\s+\*\s+[^ ]+\s+\(.*\)/

  gem_name, gem_version = /\s+\*\s+([^ ]+)\s+\((.*)\)/.match(line).to_a[1..-1]

  begin
    gem_json = `curl -s https://rubygems.org/api/v2/rubygems/#{gem_name}/versions/#{gem_version}.json`
    built_at = JSON.parse(gem_json)["built_at"]
    release_date = Date.parse(built_at).to_date

    puts "#{gem_name},#{gem_version},#{release_date.strftime("%Y-%m-%d")}"

    release_year = release_date.strftime("%Y")
    yearly_stats[release_year] ||= { count: 0, gems: [] }
    yearly_stats[release_year][:count] += 1
    yearly_stats[release_year][:gems] << gem_name
  rescue => e
    puts "#{gem_name},#{gem_version},???"
  end
end

puts
puts "Yearly summary:"
yearly_stats.sort.each do |year, data|
  puts "#{year},#{data[:count]},#{data[:gems].join(' ')}"
end