<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100">
  <style>
    .primary { fill: #d35400; }
    .secondary { fill: #2c3e50; }
    .accent { fill: #f39c12; }
    .light { fill: #ecf0f1; }
    .background { fill: #f9f4e7; }
  </style>

  <!-- Background circle -->
  <circle cx="50" cy="50" r="45" class="background" />
  <circle cx="50" cy="50" r="42" fill="white" stroke="#d35400" stroke-width="2" />
  
  <!-- Experience icon - calendar with number 15 -->
  <g transform="translate(50, 45)">
    <!-- Calendar top -->
    <rect x="-25" y="-20" width="50" height="40" rx="3" class="light" stroke="#2c3e50" stroke-width="2" />
    
    <!-- Calendar header -->
    <rect x="-25" y="-20" width="50" height="10" rx="3" class="primary" />
    
    <!-- Calendar hanger -->
    <rect x="-3" y="-25" width="6" height="5" rx="1" class="secondary" />
    
    <!-- Calendar grid lines -->
    <line x1="-25" y1="-10" x2="25" y2="-10" stroke="#2c3e50" stroke-width="1" opacity="0.5" />
    <line x1="-25" y1="0" x2="25" y2="0" stroke="#2c3e50" stroke-width="1" opacity="0.5" />
    <line x1="-25" y1="10" x2="25" y2="10" stroke="#2c3e50" stroke-width="1" opacity="0.5" />
    <line x1="-17" y1="-10" x2="-17" y2="20" stroke="#2c3e50" stroke-width="1" opacity="0.5" />
    <line x1="-8" y1="-10" x2="-8" y2="20" stroke="#2c3e50" stroke-width="1" opacity="0.5" />
    <line x1="0" y1="-10" x2="0" y2="20" stroke="#2c3e50" stroke-width="1" opacity="0.5" />
    <line x1="8" y1="-10" x2="8" y2="20" stroke="#2c3e50" stroke-width="1" opacity="0.5" />
    <line x1="17" y1="-10" x2="17" y2="20" stroke="#2c3e50" stroke-width="1" opacity="0.5" />
    
    <!-- Number 15 -->
    <g transform="translate(-2, 7)" class="secondary">
      <text x="0" y="0" font-family="Georgia" font-size="24" font-weight="bold" text-anchor="middle">15</text>
    </g>
    
    <!-- Years text -->
    <g transform="translate(0, 30)">
      <rect x="-26" y="-5" width="52" height="15" rx="3" class="secondary" />
      <text x="0" y="5" font-family="Arial" font-size="10" fill="white" text-anchor="middle">JAHRE</text>
    </g>
  </g>

  <!-- Retro style decorative elements -->
  <g opacity="0.3">
    <circle cx="15" cy="15" r="5" class="primary" />
    <circle cx="85" cy="15" r="5" class="primary" />
    <circle cx="15" cy="85" r="5" class="primary" />
    <circle cx="85" cy="85" r="5" class="primary" />
  </g>
</svg>
