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"

# Dir.chdir '...'

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_releases = JSON.parse(`curl -s https://rubygems.org/api/v1/versions/#{gem_name}.json`)

    gem = gem_releases.find { |gem_release| gem_release['number'] == gem_version }
    release_date = Date.parse(gem["built_at"]).to_date
    puts "Current: #{gem_name}, #{gem['number']}, #{release_date.strftime("%Y-%m-%d")}"

    release_year = release_date.strftime("%Y")
    yearly_stats[release_year] ||= {}
    yearly_stats[release_year][:current_count] ||= 0
    yearly_stats[release_year][:current_gems] ||= []

    yearly_stats[release_year][:current_count] += 1
    yearly_stats[release_year][:current_gems] << gem_name

    gem = gem_releases.find { |gem_release| gem_release['prerelease'] == false }
    release_date = Date.parse(gem["built_at"]).to_date
    puts "Latest:  #{gem_name}, #{gem['number']}, #{release_date.strftime("%Y-%m-%d")}" unless gem['number'] == gem_version

    release_year = release_date.strftime("%Y")
    yearly_stats[release_year] ||= {}
    yearly_stats[release_year][:latest_count] ||= 0
    yearly_stats[release_year][:latest_gems] ||= []
    
    yearly_stats[release_year][:latest_count] += 1
    yearly_stats[release_year][:latest_gems] << gem_name

    puts ''
   rescue => e
     puts "Current: #{gem_name}, #{gem_version}, ???\n\n"
  end
end

puts
puts "Yearly summary:"
puts 'Year, Current, Latest, Current Gems, Latest Gems, Diff'
yearly_stats.sort.each do |year, data|
  puts [
    year,
    data[:current_count].to_i,
    data[:latest_count].to_i,
    Array(data[:current_gems]).join(' '),
    Array(data[:latest_gems]).join(' '),
    (Array(data[:latest_gems]) - Array(data[:current_gems])).join(' ')
  ].join(", ")
end